00001 /* 00002 * CPNull.j 00003 * Foundation 00004 * 00005 * Created by Francisco Tolmasky. 00006 * Copyright 2008, 280 North, Inc. 00007 * 00008 * This library is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * This library is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with this library; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00023 @import "CPObject.j" 00024 00025 00026 var CPNullSharedNull = nil; 00027 00036 @implementation CPNull : CPObject 00037 { 00038 } 00039 00040 /*+ (id)alloc 00041 { 00042 if (CPNullSharedNull) 00043 return CPNullSharedNull; 00044 00045 return [super alloc]; 00046 }*/ 00052 + (CPNull)null 00053 { 00054 if (!CPNullSharedNull) 00055 CPNullSharedNull = [[CPNull alloc] init]; 00056 00057 return CPNullSharedNull; 00058 } 00059 00060 @end